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| Theory of continental drift |
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Definition
| continental drift is proposed by Alex Wegner in 1912. it says that the continents were once one big strip of land |
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| Similar to plant and animal fossils found on both sides of Atlantic ocean |
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| Glacial evidence in warmer climates, and Fossil ferns in cold climates |
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| Similar to rock types found on both sides of Atlantic Ocean |
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| proposed by Henry Hess in 1960's |
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| Proof 1 seafloor spreading |
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Definition
| newer rocks near Mid-Atlantic Ridge |
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| proof 2 seafloor spreading |
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| No explanation how it happened |
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| crustal sections/plates move around mantle |
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| two continental plates collide |
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| denser oceanic plate goes under less dense continental plate |
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| two oceanic plates move apart |
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| two continental plates move apart |
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| plates slide by each other |
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| continental collision forms ? |
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